# -*- coding: utf-8 -*-
"""Fixer that changes unicode to str, unichr to chr, and u"..." into "...".
Based on lib2to3
"""

#This file is part of pyLot library.
#
# pyLot is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# pyLot is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with pyLot.  If not, see <http://www.gnu.org/licenses/>.

__author__ = u'Pierre Puiseux, Guillaume Baty'
__copyright__ = u"Copyright 2011-2012 (C) andheo, Université de Pau et des Pays de l'Adour"
__credits__ = [u'Pierre Puiseux', u'Guillaume Baty']
__license__ = "GNU Lesser General Public License"

import re
from lib2to3.pgen2 import token
from lib2to3 import fixer_base

class FixStrToUnicode(fixer_base.BaseFix):

    PATTERN = "STRING | NAME<'str'>"

    def transform(self, node, results):
        if node.type == token.NAME:
            if node.value == "str":
                new = node.clone()
                new.value = "unicode"
                return new
            # XXX Warn when __unicode__ found?
        elif node.type == token.STRING:
            if re.match(r"[\'\"]", node.value):
                new = node.clone()
                new.value = 'u%s' % new.value
                return new
